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寡头组织；寡头统治集团；寡头统治的国家
An oligarchy is a small group of people who control and run a particular country or organization. You can also refer to a country which is governed in this way as an oligarchy .
例句
Athens was suffering under the rule of an oligarchy that had no concern for the people's welfare.
雅典当时饱受寡头集团的统治，他们对人民的福祉毫不关心。